19436820855841 has 9 divisors (see below), whose sum is σ = 19620647269041. Its totient is φ = 19254701000052.

The previous prime is 19436820855797. The next prime is 19436820855857. The reversal of 19436820855841 is 14855802863491.

The square root of 19436820855841 is 4408721.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 19436820855841 - 2¹³ = 19436820847649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19436820855871) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 471712546 + ... + 471753748.

Almost surely, 2^{19436820855841} is an apocalyptic number.

19436820855841 is the 4408721-st square number.

19436820855841 is the 2204361-st centered octagonal number.

It is an amenable number.

19436820855841 is a deficient number, since it is larger than the sum of its proper divisors (183826413200).

19436820855841 is an frugal number, since it uses more digits than its factorization.

19436820855841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82620 (or 41310 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 64.

The spelling of 19436820855841 in words is "nineteen trillion, four hundred thirty-six billion, eight hundred twenty million, eight hundred fifty-five thousand, eight hundred forty-one".